Now your fish can have all the benefits of garlic, plus additional nutrients to help keep your aquarium healthy. 100% organic garlic enhances appetite and contains allicin, an antioxidant. Antioxidants counteract the harmful effects of free radicals in cells. This appetite-enhancing supplement also contains an organic denitrification agent that enhances the Redox reaction (oxidation reduction) and quickly helps break down the ammonias into nitrites and nitrates. May reduce the need for frequent water changes. Treats 5,500 gallons.